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I'd guess that's because it's designed for a fixed number of letters to a plate.

Monoscpace doesn't have spacing issues and possibly make the plates easier to recognize.

One of the peculeraties of german license plates is that the number is not fixed length at all. Another one is that the dash in the plate number (which is not printed on the FE ones and only implied by position of the inspection stickers) is significant and there could be two plates with same characters that differ only in placement of said "dash".

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